Rubber composition comprising a citraconimidomaleimide
a technology of citraconimidomaleimide and composition, applied in the field of rubber composition, can solve the problems of limited strength of the obtained vulcanized rubber composition, and achieve the effect of reducing the reversion level of the vulcanized rubber composition, and improving the reversion resistan
Inactive Publication Date: 2008-10-28
MICHELIN RECH & TECH SA
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- Application Information
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Benefits of technology
"The patent text describes a new rubber composition that can be used to make tires with improved resistance to reversion (which is a process where the rubber composition returns to its original state after being vulcanized). The composition includes a specific maleimide compound that does not require any additional coagents to reduce reversion. The use of this compound makes the rubber composition more durable and long-lasting. The patent also describes a process for preparing the rubber composition and the use of the composition in tires and other rubber products. The technical effect of this invention is to provide a better quality rubber composition that is more durable and long-lasting."
Problems solved by technology
However, sulphur vulcanization has the known drawback of resulting in limited strength of the vulcanized rubber compositions obtained, due to thermal ageing of the latter.
Method used
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I. Measurements and Tests Used
[0022]The rubber compositions are characterized, before and after curing, as indicated below.
I-1. Mooney Plasticity
[0023]An oscillating consistometer such as described in French Standard NF T 43-005 (1991) is used. The Mooney plasticity is measured in accordance with the following principle: the composition in the uncured state (i.e. before curing or vulcanization) is molded in a cylindrical enclosure heated to 100° C. After one minute's preheating, the rotor turns within the test piece at 2 rpm, and the torque used for maintaining this movement is measured after four minutes' rotation. The Mooney plasticity (ML 1+4) is expressed in “Mooney units” (MU, with 1 MU=0.83 N.m).
I-2. Scorching Time
[0024]The measurements are effected at 130° C., in accordance with French Standard NF T 43-005 (1991). The evolution of the consistometric index as a function of time makes it possible to determine the scorching time for the rubber compositions, assessed in accordanc...
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Abstract
A rubber composition, usable for the manufacture of tires, is based on at least one diene elastomer, reinforcing filler, vulcanization system and, as anti-reversion agent, a citraconimidomaleimide compound of the formula (R=hydrocarbon radical):The composition may be used for the manufacture of a finished article or a semi-finished product made of rubber intended for a ground contact system of an automobile, in particular of a tire.
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of International Application No. PCT / EP2004 / 010253, filed Sep. 14, 2004, published Mar. 24, 2005, in French, as WO 2005 / 026250, and claims priority based on French Application No. 0310820, filed Sep. 15, 2003, the disclosures of both applications being incorporated herein in their entirety.BACKGROUND OF THE INVENTION[0002]The present invention relates to rubber compositions intended in particular for the manufacture of tires or of semi-finished products for tires, and also to the anti-reversion agents usable for thermal protection of such compositions.DESCRIPTION OF RELATED ART[0003]Since the discovery of the vulcanization or cross-linking of rubber by sulphur, numerous improvements have been made to the base process, but sulphur at present still remains the element which is indispensable from the industrial point of view for cross-linking diene elastomers. The principle of vulcanization lies in the crea...
Claims
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IPC IPC(8): C08K5/34B60C1/00C08K5/3415
CPCB60C1/00C08K5/3415C08L21/00
Inventor ARAUJO DA SILVA, JOSE CARLOSBELIN, LAUREBLANCHARD, CHRISTIANE
Owner MICHELIN RECH & TECH SA